package com.molichuxing.framework.utils;

import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;

import org.apache.commons.codec.digest.DigestUtils;

/**
 * @date
 */
public class Md5Util {

	private static final String[] HEX_DIGITS = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d",
			"e", "f" };

	public final static String md5Hex(String s) {
		if (s != null) {
			return Md5Util.md5(s).substring(8, 24);
		} else {
			return null;
		}
	}

	public final static String md5(String s) {
		char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			byte[] btInput = s.getBytes();
			// 获得MD5摘要算法的 MessageDigest 对象
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			// 使用指定的字节更新摘要
			mdInst.update(btInput);
			// 获得密文
			byte[] md = mdInst.digest();
			// 把密文转换成十六进制的字符串形式
			int j = md.length;
			char[] str = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	private static String byteArrayToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}

		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0) {
			n += 256;
		}
		int d1 = n / 16;
		int d2 = n % 16;
		return HEX_DIGITS[d1] + HEX_DIGITS[d2];
	}

	public static String md5Encode(String origin, String charsetname) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			if (charsetname == null || "".equals(charsetname)) {
				resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
			} else {
				resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
			}
		} catch (Exception exception) {
		}
		return resultString;
	}

	public static String md5Hex(InputStream is) throws IOException {
		return DigestUtils.md5Hex(is);
	}

	public static String md5Hex(byte[] data) throws IOException {
		return DigestUtils.md5Hex(data);
	}

	 public static final String MD5(String s) {
	        char[] hexDigits = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
	        try {
	            byte[] btInput = s.getBytes("UTF-8");
	            MessageDigest mdInst = MessageDigest.getInstance("MD5");
	            mdInst.update(btInput);
	            byte[] md = mdInst.digest();
	            int j = md.length;
	            char[] str = new char[j * 2];
	            int k = 0;

	            for(int i = 0; i < j; ++i) {
	                byte byte0 = md[i];
	                str[k++] = hexDigits[byte0 >>> 4 & 15];
	                str[k++] = hexDigits[byte0 & 15];
	            }

	            return new String(str);
	        } catch (Exception var10) {
	            var10.printStackTrace();
	            return null;
	        }
	    }

	
}
